diff --git a/src/p_user.c b/src/p_user.c
index 892f4b678482a1199127feca7a97b64aeb202b83..292e452d77f55044badcf39ceb101c865cc47d0e 100644
--- a/src/p_user.c
+++ b/src/p_user.c
@@ -5924,7 +5924,7 @@ static void P_3dMovement(player_t *player)
 	player->rmomy = player->mo->momy - player->cmomy;
 
 	// Calculates player's speed based on distance-of-a-line formula
-	player->speed = P_AproxDistance(player->rmomx, player->rmomy);
+	player->speed = R_PointToDist2(0, 0, player->rmomx, player->rmomy);
 
 	// Monster Iestyn - 04-11-13
 	// Quadrants are stupid, excessive and broken, let's do this a much simpler way!